Mixed technology MEMS/SiGe BiCMOS digitalized analog front end with direct RF sampling

a digitalization and analog front end technology, applied in the direction of pulse technique, amplitude demodulation, line-faulst/interference reduction, etc., can solve the problem of large bandwidth of the resulting signal, signal is subject to intentional or unintentional jamming, and presenting the greater obstacle to accurate reception of the transmitted signal

Active Publication Date: 2007-03-06
RAYTHEON CO
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007]In the light of the foregoing, the invention relates to an integrated circuit digitizing analog front end for a receiver, which includes a substrate; a low noise amplifier (LNA) on the substrate; an analog-to-digital converter (ADC) on the substrate; a plurality of micro electro mechanical system (M

Problems solved by technology

The spectrum of the resulting signal occupies a large bandwidth and appears noise-like.
The signal is subject to intentional or unintentional jamming.
Thus, it is the in band signals that present the greater obstacle to accurate reception of the transmitted signal.
Another effect on system design and system performance in a jamming environment is in power consumption and signal distortion.
In a jamming environment when the jamming signals are not removed near the antenna, the compo

Method used

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  • Mixed technology MEMS/SiGe BiCMOS digitalized analog front end with direct RF sampling
  • Mixed technology MEMS/SiGe BiCMOS digitalized analog front end with direct RF sampling
  • Mixed technology MEMS/SiGe BiCMOS digitalized analog front end with direct RF sampling

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Embodiment Construction

[0013]The following is a detailed description of the present invention with reference to the attached drawings, wherein like reference numerals will refer to like elements throughout.

[0014]Referring now to FIG. 1, a digitizing analog front end (DAFE) 50 in accordance with one embodiment of the present invention is illustrated. An antenna or antenna array 57 for receiving a composite radio signal is connected to an input port 58 of the DAFE 50. Upon entering the DAFE 50, the composite signal enters a pre-selector and anti-jamming filter (PS / AJ) 62 for pre-selection of the desired frequency band and for excision of narrow band jammers. The output of the PS / AJ filter 62 is electrically connected to the input of a low noise amplifier (LNA) 64. The pre-selection portion of the PS / AJ filter 62 provides coarse filtering to reduce saturation of the LNA 64 by out of band jamming, co-site or ambient signals.

[0015]The output of the LNA is electrically connected to the input of an anti-aliasing...

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Abstract

A digitizing analog front end (DAFE) using mixed technology on a single substrate is described. SiGe BiCMOS technology is implemented for the semiconductor components, which include a low noise amplifier and an analog-to-digital converter. Micro Electro Mechanical System (MEMS) switches are used to change the filtering characteristics of several filters, including an anti-aliasing filter and a pre-select and anti-jamming filter.

Description

FIELD OF THE INVENTION[0001]The present invention relates to protection of analog to digital converters (ADC), to the reduction of power consumption and to the maintenance of high signal quality in a radio receiver's analog front end in the presence of large interfering and jamming signals. More particularly, the invention relates to a single chip receiver utilizing micro electromechanical system (MEMS) technology to receive wideband or spread-spectrum signals in a jamming environment with a low resolution ADC, such as in a Global Positioning System (GPS) receiver.BACKGROUND OF THE INVENTION[0002]This invention is applicable to all communication systems. A spread-spectrum system will be used to illustrate its use and effectiveness. Spread-spectrum communication systems transmit information digitally on a carrier that has been modulated with a high-rate pseudorandom binary sequence. The spectrum of the resulting signal occupies a large bandwidth and appears noise-like. The signal is ...

Claims

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Application Information

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IPC IPC(8): H03H9/00H04B1/10H01H1/00
CPCG01S19/21H04B1/0003H04K3/90H04B1/1036H04B1/109H04K3/228H04B1/0007H01H1/0036H04B1/10H01H59/00
Inventor KENT, III, SAMUEL D.LINDER, LLOYD F.CAI, KHIEM V.
Owner RAYTHEON CO
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